#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
#define MOD 1000000007
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3f
#define EPS (1e-10)
using namespace std;
typedef long long ll;
typedef pair<int,int>P;

signed main(){
	int a,b;cin>>a>>b;
	int n;cin>>n;
	set<int>se;
	int d=0;
	rep(i,n){
		int c;cin>>c;
		if(se.count(c))d+=a+b;
		se.insert(c);
	}
	cout<<d<<endl;
}